Analysis of Laser Action in ZnO Tetrapods Obtained by Carbothermal Synthesis

Тарасов, А. П.; Брискина, Ч. М.; Маркушев, В. М.; Zadorozhnaya, L. A.; Лавриков, А. С.; Каневский, В. М.

doi:10.1134/s0021364019230115

Cited by 10 publications

(2 citation statements)

References 3 publications

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“…where N is the mode number, 𝑛(𝐸) is a reflection index, D is the hexagonal cavity's diameter, and h is the Planck constant [14,25]. In the case under study, the use of the refractive index dispersion relation, which was obtained in [13] for ZnO microcrystals fabricated by the same method, allows us to estimate the diameter of the lasing microrod as D ≈ 14 μm [22]. The left inset of Figure 2a shows a spectral region with the most intense laser line, More details about growth mechanisms, experimental research methods, and the equipment used can be found elsewhere [22][23][24].…”

Section: Resultsmentioning

confidence: 99%

“…Speaking about the efficiency of ZnO laser structures in terms of achieving low lasing thresholds and high optical Q-factors, the most promising ones are those supporting whispering gallery modes (WGMs). Due to total internal reflection and, consequently, low optical losses, these microlasers demonstrate much better energy efficiency compared to their Fabry-Perot counterparts [12,13]. The study of the fundamental properties of WGM microlasers, as well as their practical applications, is an important task of modern semiconductor physics and materials science in terms of obtaining functional objects on the micro and nanoscale.…”

Section: Introductionmentioning

confidence: 99%

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Excitonic Mechanisms of Stimulated Emission in Low-Threshold ZnO Microrod Lasers with Whispering Gallery Modes

2022

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Whispering gallery mode (WGM) ZnO microlasers gain attention due to their high Q-factors and ability to provide low-threshold near-UV lasing. However, a detailed understanding of the optical gain mechanisms in such structures has not yet been achieved. In this work, we study the mechanisms of stimulated emission (SE) in hexagonal ZnO microrods, demonstrating high-performance WGM lasing with thresholds down to 10–20 kW/cm2 and Q-factors up to ~3500. The observed SE with a maximum in the range of 3.11–3.17 eV at room temperature exhibits a characteristic redshift upon increasing photoexcitation intensity, which is often attributed to direct recombination in the inverted electron-hole plasma (EHP). We show that the main contribution to room-temperature SE in the microrods studied, at least for near-threshold excitation intensities, is made by inelastic exciton-electron scattering rather than EHP. The shape and perfection of crystals play an important role in the excitation of this emission. At lower temperatures, two competing gain mechanisms take place: exciton-electron scattering and two-phonon assisted exciton recombination. The latter forms emission with a maximum in the region near ~3.17 eV at room temperature without a significant spectral shift, which was observed only from weakly faceted ZnO microcrystals in this study.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Excitonic Mechanisms of Stimulated Emission in Low-Threshold ZnO Microrod Lasers with Whispering Gallery Modes

2022

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Emission mechanisms in low-threshold UV random laser based on ZnO microrod array

Tarasov,

Zadorozhnaya,

Kanevsky

2024

Journal of Applied Physics

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Despite rather extensive study of the random lasing effect in ZnO structures, the issue of the optical gain mechanisms in microstructured ZnO random lasers remains poorly understood. In this work, the radiative properties of an array of vertically aligned ZnO microrods, synthesized by a modified thermal evaporation method, were studied. The microrods exhibited lengths up to 60 μm and diameters ranging from 1 to 5 μm. Random lasing from a microrod array was observed in the near-UV range (with a laser emission peak wavelength of ∼391 nm) with a threshold down to 40 kW/cm2 under optical excitation. An analysis of the nature of optical gain in the grown structure was conducted at various temperatures. It was found that at room temperature, two-phonon-assisted exciton recombination is the main process leading to light amplification.

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Luminescent properties of a ZnO whisker array as a scintillation detector material

Тарасов¹,

Venevtsev²,

Муслимов³

et al. 2021

Quantum Electron.

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We have studied luminescent properties of a ZnO whisker array, a promising crystalline material for scintillation detectors, capable of ensuring a fast and strong response and a short afterglow time. Measurements have been performed under X-ray and UV optical excitation. We present a comparative analysis of spectral features of the near-band-edge emission of the whisker array at low (∼80 K) and room temperatures in relation to the excitation method.

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Analysis of Laser Action in ZnO Tetrapods Obtained by Carbothermal Synthesis

Cited by 10 publications

References 3 publications

Excitonic Mechanisms of Stimulated Emission in Low-Threshold ZnO Microrod Lasers with Whispering Gallery Modes

Excitonic Mechanisms of Stimulated Emission in Low-Threshold ZnO Microrod Lasers with Whispering Gallery Modes

Emission mechanisms in low-threshold UV random laser based on ZnO microrod array

Luminescent properties of a ZnO whisker array as a scintillation detector material

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